Vladimir Ilyich Ulyanov, better known as Vladimir Lenin, was a Russian revolutionary, politician, and political theorist. He served as the first and founding head of government of Soviet Russia from 1917 until his death in 1924, and of the Soviet Union from 1922 to 1924. Under his administration, Russia, and later the Soviet Union, became a one-party socialist state governed by the Communist Party. Ideologically a Marxist, his developments to the ideology are called Leninism.

Lenin was born Vladimir Ilyich Ulyanov in Streletskaya Ulitsa, Simbirsk, now Ulyanovsk, on 22 April 1870, and baptised six days later; as a child, he was known as Volodya the common nickname variant of Vladimir. He was the third of eight children, having two older siblings, Anna (born 1864) and Alexander (born 1866). They were followed by three more children, Olga (born 1871), Dmitry (born 1874), and Maria (born 1878). Two later siblings died in infancy. His father, Ilya Nikolayevich Ulyanov, was a devout member of the Russian Orthodox Church and baptised his children into it, although his mother, Maria Alexandrovna Ulyanova (née Blank), a Lutheran by upbringing, was largely indifferent to Christianity, a view that influenced her children.

Lenin saw himself as a man of destiny and firmly believed in the righteousness of his cause and his own ability as a revolutionary leader. Biographer Louis Fischer described him as "a lover of radical change and maximum upheaval", a man for whom "there was never a middle-ground. He was an either-or, black-or-red exaggerator". Highlighting Lenin's "extraordinary capacity for disciplined work" and "devotion to the revolutionary cause", Pipes noted that he exhibited much charisma. Similarly, Volkogonov believed that "by the very force of his personality, had an influence over people". Conversely, Lenin's friend Gorky commented that in his physical appearance as a "baldheaded, stocky, sturdy person", the communist revolutionary was "too ordinary" and did not give "the impression of being a leader".